Virus Titration Method
Virus Titration Method - Related Videos
11:48
Generation, Amplification, and Titration of Recombinant Respiratory Syncytial Viruses
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Cited by 12 •
2019
We describe a method for generating and amplifying genetically modified respiratory syncytial viruses (RSVs) and an optimized plaque assay for RSVs. We illustrate this protocol by creating two recombinant viruses that respectively allow quantification of RSV replication and live analysis of RSV inclusion bodies and inclusion bodies-associated granules dynamics.
04:32
Plaque Titration Assay for Quantification of Infectious Respiratory Syncytial Virus
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2026
Source: Bouillier, C., et al. Generation, Amplification, and Titration of Recombinant Respiratory Syncytial Viruses. J. Vis. Exp. (2019)The video demonstrates a plaque titration assay used to quantify infectious recombinant respiratory syncytial virus (RSV) in epithelial cell monolayers. It presents the infection of host cells with serially diluted viral suspensions, the restriction of viral spread by a cellulose-based semi-solid overlay, and the formation of localized plaques from cytopathic...
08:09
High-throughput Titration of Luciferase-expressing Recombinant Viruses
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Cited by 14 •
2014
This article presents a high-throughput luciferase expression-based method of titrating various RNA and DNA viruses using automated and manual liquid handlers.
10:17
Introduction to Titration
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2023
Source: Laboratory of Dr. Yee Nee Tan — Agency for Science, Technology, and Research Titration is a common technique used to quantitatively determine the unknown concentration of an identified analyte.1-4 It is also called volumetric analysis, as the measurement of volumes is critical in titration. There are many types of titrations based on the types of reactions they exploit. The most common types are acid-base titrations and redox titrations.5-11 In a typical titration process, a standard...
10:05
High-throughput Detection Method for Influenza Virus
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Cited by 8 •
2012
This method describes the use of Infrared dye based imaging system for detection of H1N1 in bronchioalveolar lavage (BAL) fluid of infected mice at a high sensitivity. This methodology can be performed in a 96- or 384-well plate, requires <10 μl volume of test material and has the potential for concurrent screening of multiple pathogens.
FAQs
Serial dilution spreads a range of virus concentrations across separate test conditions. The more dilute samples can produce fewer visible infection-associated responses, allowing researchers to identify a dilution with a countable endpoint. That observed response is then used in the infectious-titer calculation, making results more suitable for comparing samples and applying consistent doses in later assays.
Susceptible cells provide the biological system in which an infectious virus can generate a measurable response. After diluted virus is added, infection may appear as visible plaques, cytopathic effects, or another defined endpoint. Selecting the endpoint appropriate to the assay allows the result to represent infectious activity. This biological readout connects the dilution series to the infectious titer calculated from it.
Plaques and cytopathic effects are alternative visible outcomes that can mark infection during titration. A plaque-based readout records plaques, whereas a cytopathic-effect readout records cytopathic effects. Because the assay depends on a specified endpoint, researchers must interpret the selected response consistently when calculating titers and comparing experiments.
Countability is important because the selected dilution supplies the observable response used for calculation. If the response cannot be reliably counted or recognized, the resulting infectious titer becomes less useful for comparing samples. Using a dilution with a defined, countable endpoint therefore supports reproducibility and helps researchers standardize the infectious dose applied in subsequent experiments.
A basic workflow begins with a virus suspension, prepares serial dilutions, and adds those dilutions to susceptible cells. The assay is then assessed for plaques, cytopathic effects, or another defined endpoint. Researchers identify the dilution that gives a countable response and use that measurement to calculate infectious titer, which can guide dosing in later experiments.
The essential setup includes a virus suspension, a series of dilutions, susceptible cells, and a way to recognize the assay's defined endpoint. Depending on the chosen readout, that endpoint may be visible plaques, cytopathic effects, or another specified response. Keeping these components aligned lets the measured response support infectious-titer calculation and comparison across experiments.
It supports several kinds of biological investigation, including vaccine testing, antiviral testing, viral growth studies, diagnostic assay development, and controlled infection experiments. In each case, the measured infectious titer helps researchers compare viral samples or apply a defined infectious dose. This makes titration useful both for evaluating interventions and for designing repeatable experiments.
Consistent titering lets researchers apply comparable infectious doses across samples and experimental conditions. That standardization reduces a major source of variation when biology experiments are compared, helping investigators interpret differences in viral growth, assay responses, or treatment outcomes more confidently. The method therefore connects measurement of the starting virus preparation with reproducibility in downstream biological studies.